[time-nuts] PC clock generator without 14.318MHz
vs at cesnet.cz
Wed Oct 19 12:02:19 EDT 2016
On 10/18/2016 11:23 PM, Mike Cook wrote:
>> Le 18 oct. 2016 à 16:53, Vladimir Smotlacha<vs at cesnet.cz> a écrit :
>> I have operated own NTP servers with stable system clock for many years. The principle is quite simple - I replaced 14.318 MHz quartz with OCXO based circuit. Now I have to build few more servers with modern mini-ITX motherboards, however on many of them (e.g. from ASUS) I can’t find any 14.317 MHz quartz. Such frequency is a relic of original PC design and I wonder if it is used any other basic frequency in recent clock generators?
> The 14.317MHz xtal was connected to the south bridge controller chip, but for recent CPUs this has gone away as has northbridge and the system clock has been integrated into the PCH (Platform Controller Hub) chip according to Wikipedia, so I suspect that if you find the clock feeding that , then you could stabilize it in that same way.
Thank you Mike, PCH will be object of my experiments.
I wonder than probably nobody solved stable clock source in "post
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